don't delete previewyear on dry_run

compendium_v2/routes/survey.py

@@ -305,10 +305,11 @@ def publish_survey(year) -> Any:
     except ValueError as e:
         return {'message': str(e)}, 400
 
-    db.session.execute(delete(PreviewYear).where(PreviewYear.year == year))
+    if not dry_run:
+        db.session.execute(delete(PreviewYear).where(PreviewYear.year == year))
 
-    survey.status = SurveyStatus.published
-    db.session.commit()
+        survey.status = SurveyStatus.published
+        db.session.commit()
 
     result = {'success': True}
     if output: